In 2010, In Europe, 4.380 people died because they could not find a replacement organ. (12 people a day). That's not so many people (sure, one person that dies is one too many). However, lots of money has been spend on convincing the population. So I don't think pressure works. I think the organs will be used for other things.I prefer to not donate to highten the pressure to allow for more R'n'D towards growing organs on demand in vitro.
Still, a good idea. For your organs to be useful, you need to die inside a hospital (to determine clinical death) and only then the organs are allowed to be harvested. Then transport, cooling not freezing, etc needs to be done very fast.That is why I'd rather like to sell mine posthumously and donate that money to doctors without borders, but alas I haven't found that possibility yet.
Checks for compatibility and such needs to be done beforehand. All that is costly, so if you need to set up the infrastructure, it's not competitive (you'd turn a loss).